The revealing shot—which is sure to fire up many 1D fans—was taken back in 2010, when Harry was just 16 years old and competing on The X Factor and before he nabbed a spot in the Simon Cowell-formed, widely successful boy band.

The sexy star has yet to explain the reason for rocking the skimpy underwear, but we're guessing the well-coiffed lad was just messing around with his mates.

Glad to see Styles has always been confident and comfortable in his own skin.